Date: Mon, 13 Apr 1998 16:22:21 -0400 (EDT)
From: "C. W. Wright (1698)" <wright@aol11.wff.nasa.gov>
To: rtl@rtlinux.cs.nmt.edu
Subject: [rtl] *Fast* IRQ response  ( 2.08us )



Greetings,

   I just measured the time from the leading edge of the IRQ signal to the
leading edge of a pulse generated by my rt-linux handler at 2.08us most of
the time and sometimes just under 4us.   The measurements made using a
Lecroy 9384 1gHz digital scope with one probe on the irq signal and the
other on the LPT port I'm pulsing.

The system is 2.0.29 rtl 0.6, 200mhz p5 with 64mb ram, 3-4gb scsi drives,
500ms/s Gage PCI waveform digitizer, and an ISA board full of specialized
PIC chips.

Looking at the signals on the scope, they appear virtually jitter free and
very clean.  Even when running  " find / -name dlfkldf -print " the
signals remain stable.  This is just the opposite of how windoze reacts
of course.

W. Wright

   http://aol11.wff.nasa.gov/rtlinux


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